- 250mg plant-based calcium per capsule
- Calcium carbonate (32% calcium) from calcified Atlantic Lithothamnium red algae
- Sustainable harvesting in the Atlantic, exceptionally low in heavy metals
- Increased bioavailability due to organic structure
- Calcium content guaranteed by the manufacturer
- Vegan, non-GMO, tested for harmful substances
Phytocalcium
400mg High-Dose Capsules
Our Phytocalcium offers highly bioavailable, natural calcium carbonate from Lithothamnium calcareum red algae providing 250mg of calcium per capsule. Vegan. 120 capsules.
- Calcium from calcified Atlantic red algae (Lithothamnium calcareum)
- 250mg elemental calcium per capsule (at least 32%)
- Calcium in a natural complex with magnesium
- Increased bioavailability due to organic structure
- Calcium for bones, teeth, electrolyte balance and digestive enzymes
- Calcium for energy metabolism, reduction of tiredness and fatigue, blood clotting and the nervous system
- Sustainably sourced in the Atlantic, extremely low in heavy metals
- Vegan, non-GMO, tested for harmful substances
How are we different?
Our calcium is obtained from the sustainable extraction of calcified Atlantic Lithothamnium red algae. Due to its organic structure, our phytocalcium has particularly good bioavailability.
Atlantic Lithothamnium red algae has an exceptionally high concentration of naturally bound calcium (32%). The calcium is present in the form of calcium carbonate and is embedded in a mineral complex with magnesium. During its growth, the algae absorb these from the seawater and form their cell structures. After dying, the algae body calcifies into a finely porous, skeleton-like structure and sediments separately from the younger algae on the seabed of the Atlantic Ocean. In various locations, these sediments can eventually be sustainably harvested.
Our phyto-calcium consists of 100% natural calcified Lithothamnium calcareum from Iceland, which is harvested, cleaned and milled according to HACCP and ISO 22000:2018 standards, ensuring processing with minimal heavy metal and microbiological values, resulting in a red algae powder of maximum purity and compatibility. As a result, the heavy metal values, despite the origin from the seabed, are significantly below the European limits.
For the capsule shells we use custom-made HPMC capsules that, unlike most other HPMC and pullulan capsules on the market, are 100% free from controversial additives such as carrageenans and PEG. We then package this product in environmentally friendly amber glass.
- Premium active ingredients in their purest form, sourced directly from the world’s best producers
- Select raw materials as the basis of all our formulations
- Our commitment: complete avoidance of all unnecessary additives, technical excipients and chemical extraction agents
- If additives are needed, valuable natural ingredients are prioritised
- Voluntary disclosure of every ingredient
- In-house production to achieve our high standards of purity and quality
- High-quality custom production of liquid products and (functional) foods as well as tablets by selected partners
- Packaging and encapsulation in Germany and the EU according to HACCP, GMP and ISO 22000:2018 standards
- Independent laboratory tests available on the product page
- Vegan capsule shells 100% without PEG or carrageenans
- Amber glass or high-quality, resealable bags featuring an aroma barrier to protect against oxidation and contamination used for packaging
- Storage in amber glass or product-specific, food-safe containers according to EC 10/2011
- Shipping boxes made from safe, sustainable materials
- All products 100% free from magnesium stearate, nanoparticles (no legal opportunism), titanium dioxide, genetic engineering and artificial colours and flavours
- Sugar or sweeteners deliberately added only when necessary, such as for functional or product-specific reasons
Effects
Calcium
Calcium exists in greater quantities than any other mineral in the human body. 99% of bodily calcium is located in the bones and teeth, where it provides structural stability and strength. Additionally, calcium plays a role in various cellular processes, including energy production, blood clotting, signal transmission between nerve cells and the excitation of muscles and nerves.
Plant-Based Calcium Carbonate with High Bioavailability
The plant-based calcium found in calcified Lithothamnium red algae is organically formed calcium carbonate, which differs fundamentally in form and fine structure from calcium carbonate from inorganic sources such as limestone. Unlike limestone, algae calcium is finely porous, which increases the surface area and thus the solubility and bioavailability of the calcium carbonate.
Phytocalcium from Red Algae
In addition to highly bioavailable calcium, Lithothamnium red algae naturally contains a range of other minerals and trace elements absorbed from seawater. Magnesium is present in particularly significant quantities.
According to the European Food Safety Authority (EFSA):
Calcium contributes to:
- Normal blood clotting
- Normal energy metabolism
- Normal muscle function
- Normal signal transmission between nerve cells
- The normal function of digestive enzymes
- Plays a role in cell division and specialisation
- The maintenance of normal bones
- The maintenance of normal teeth
- Reducing the risk of bone mineral density loss in postmenopausal women. Low bone mineral density is a risk factor for osteoporotic fractures
- Normal growth and bone development in children
Dosage
Directions
Take 4 capsules (250mg calcium per capsule) per day with 200ml water before a meal.
Contraindications
Due to the naturally fluctuating iodine content, this product is not suitable for individuals with thyroid disorders.
Food Supplement
Do not exceed the recommended daily intake. Food supplements are not a substitute for a balanced, varied diet and healthy lifestyle. Keep out of reach of young children.
Storage
Store in a cool, dry place away from direct sunlight and heat.
Contents
Ingredients: Red Algae Powder (Lithothamnium calcareum), Capsule Shell (Hydroxypropyl Methylcellulose).
Contains: 120 capsules
| Nutrition Information per 2 Capsules | %NRV* | |
| Red Algae Powder | 2580mg | ** |
| of which calcium | 825.6mg | 100 |
| of which magnesium | 56.76mg | 15 |
| of which iron | 2.58mg | 18 |
| of which iodine | 38.7µg | 25 |
* Nutrient Reference Value
** no NRV established
Per capsule: 412mg calcium
In total: 49,536mg calcium per jar
Product Details
| Origin | Atlantic Ocean, Iceland |
| Production | Bottling and encapsulation in the EU according to HACCP, GMP and ISO 22000:2018 standards. In-house capsule production in Europe. High-quality custom production of liquid products and (functional) foods for sports and everyday use. Production of tablets by selected partners according to HACCP / GMP standards. Storage in amber glass or product-specific, food-safe containers according to EC 10/2011. Shipping in sustainable and food-safe boxes. |
| Premium plant-based cellulose (HPMC): vegan & free from unnecessary additives such as carrageenans and PEG. | |
| Packaging | Amber glass to protect against light and oxidation (free from plasticisers and BPA). |
| To Reuse | Remove product label by soaking the glass in warm water for 5 minutes. Glue residue can be removed with dish soap. |
Laboratory Tests
The purity of our formulas is important to us. This is why we have both our raw ingredients as well as our finished products extensively tested by independent laboratories to confirm purity and active ingredient content. Here, we have provided the results of some of the tests carried out on this product.
Sunday Natural
Our philosophy
For thousands of years, cultures all over the world have been using a variety of plants and nutritious foods to naturally foster vitality and good health.
With our products, we try to emulate this ancient wisdom as much as possible.
Consequently, our philosophy is simple: in everything we produce, we strive for the highest standards of quality and purity, with a focus on organic and natural ingredients.
We follow this philosophy with meticulous care on all levels, down to every last detail.




